weird (strange) behavior of sequence-polyline combination

Please post your .ggb file

0+polyline() creates a sequence of numbers. It requires less memory that sequence of polylines that internally is a collection of points and segments

same as mathmagic but with others words

Sequence(0 + Polyline(First(pf,n)),n,1,Length(pf)) create a list of length of polyline and each element is the length of a polyline (1 value)

Sequence(Polyline(First(pf,n)),n,1,Length(pf)) create a list of polylines and each element has a lot of points

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Quote:Can anybody explain this strange behavior?

no: it is also for me strange (I try first with Length() but this not works and I found "0+" as "workaround")

but often (not always) ggb give back a value of an object instead the object himself. The exact rule I do not know (for example Area for Polygon)

Quote: (is my guess correct?) Yes.

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OK - thank you folks for your answers - especial "rami" (I hope I am not going on your nerves) but I wondered at your answer about "0+" at this command - seems to be useless here, but now I understand.

Thanks to all!

Only for them who visit this thread:

an alternative (but needs 2 command lines)

distances= Sequence(Distance(pf(n), pf(n - 1)), n, 2, Length(pf)) //distance of 2 neighbors

Join({0}, Sequence(Sum(distances, n), n, 1, Length(distances))) // sum up until n

advantage: no tricks with 0+

drawback: longer